I returned home today to find that my Sure Signal has no lights and is emitting a low pitched hum and a burning smell. I have now switched it off and learn from various other threads on here that this is a known fault. I need this for work, as no coverage in my village, but am concerned that a replacement will be dangerous.

Am I expected to buy another unit or will this be replaced as clearly this is a common and known fault. Why have all the existing units not been recalled?

Unless enough users report failed devices to Trading Standards then there will be no chance of any voluntary recall of the product.

You state the device was humming? Do you still have it available for testing independently?

Please ensure that you report yours to Trading Standards and read page one of my thread which clearly states any failed device will be replaced, an agreement they arefailing to adhere to without a fight.